• 作者： 郭耀煌; 李健興; 陳朝烈
• 作者服務機構： 國立成功大學資訊工程研究所
• 中文摘要： 本文提出並分析一個多維加權模糊均值濾波器(MWFM filter)於彩色影像復原之方法。MWFM為加權模糊均值濾波器(WFM filter)再加上一模糊檢測器(fuzzy detector)及動態選擇器(dynamic selector)來解決WFM filter在細微訊號處理的問題。模糊檢測器使用兩個模糊區間並參考WFM filter之輸出來檢測突波雜訊(additive impulse noise)之振幅，其檢測效能與穩定度比傳統檢測器好。動態選擇器經由WFM filter與模糊檢測器之輸出結果來決定此濾波器之最後輸出。經由動態選擇的方法，MWFM filter不但可以保有WFM filter在處理高雜訊影像時之高穩定性。更可改善WFM filter在低雜訊影像之處理能力。所以，不論欲處理之影像有無被損毀，甚至完全被突波雜訊所污損，MWFM filter皆能有效的處理。本濾波器中的各個重要硬體單元由LR模糊基本元件所合成，其硬體複雜度遠比中問值濾波器（Median filter)簡單。該基本元件採用類比電流模式的技術以達到高速、低功率、小電路面積的目標，每一個基本元件都同時地執行每秒6,600,000模糊推論，實為一高速的濾波器。
• 英文摘要： A Multi-dimensional Weighted Fuzzy Mean (MWFM) filter used in color image filtering is proposedand analyzed in this paper. MWFM is an extension of the Weighted Fuzzy Mean (WFM) filter withembedding of a fuzzy detector and a dynamic selector into WFM to overcome the poor performance ofWFM in detail signal preservation. The fuzzy detector uses two fuzzy intervals and refers to the WFM-filtered outputs to detect the amplitude of impulse noise which will be used by the dynamic selector. Itsdetection capability is better than that of the conventional detector weighted by a crisp interval. Moreover,it results in high stability over the full range of noise occurrence probability．By means of the dynamicselection approach, MWFM not only preserves the high stability and performance of WFM in removingheavy additive impulse noise, but also improves the performance of WFM for light additive impulse noise.Therefore, it can filter corrupted color images well under from noise-free conditions to noise-full conditions.For dedicated hardware implementation, the kernel of the MWFM filter, WFM, is synthesized using genericLR fuzzy cells which realize high-speed fuzzy inference. The hardware complexity is much simpler thanthat of the conventional median filter, and simulation results show that up to 6.6 M pixels per secondcan be filtered by a WFM filter with a small chip area.
• 中文關鍵字： WFM; MWFM; color image filtering; fuzzy detector; dynamic selector; generic LR fuzzy cells
• 英文關鍵字： --